Can you provide the output of show ip nat translationSent from Cisco Technical Support iPhone App

and provide show vlan brief

then there might be a layer 2 issue in then network, because as shown in this link http://www.cisco.com/en/US/products/ps6366/products_configuration_example09186a0080665cdf.shtml?referring_site=bodynav#apsthe required configuration on the switch whic...

try to configure the interfaces connected to the APs as access modeinterface g1/0/4no switchport mode trunkswitchport mode access

try to connect directly to interface f0/0 and take an IP from the 192.168.2.0/24 range, if you get internet connection then it might be an issue with the linux boxafter that connect behind the linux proxy and take an IP from the 192.168.1.0/24 range ...